How to send continuous data from simulink block

Hello,

I have to develop a model in Simulink which can send data continuously, the sent data should be stored in a block and if it reaches some predetermined value. It should trigger the next block.

I increase the value of a constant block by this code..!

for a=1:0.1:10
set_param('MyModelName/Constant','Value',num2str(a)) %send a to the model
pause(1) %pause for 1 second
end

but it is not sending the data continuously, everytime i have to press Run button.

let me know ur idea

Thanks in advance

[Azzi Abdelmalek]

what do you want exactly to do? and from where u are sending data

[Rahul kumar]

I want to send data from a constant block continuously to a data storage block..! and if the data storage block reaches some predetermined value. It should trigger the next block.

[Rahul kumar]

Can u please explain with block examples.. cas i am new to simulink matlab.. thanks alot

[Albert Yam]

What is a data storage block? [My Simulink Browser couldn't find it. Note. Simulink 6.6.1]

What do you want to have happen?

a=1:0.1:10  ->  if a>thresh -> [boolean used as a trigger for enable]

Is this right?

[Rahul kumar]

Nt exactly Data storage block.. A block which can store some boolean data..! n if this block reaches a threshold value (say 5) it should trigger the next block.

And

if a>thresh -> [boolean used as a trigger for enable] this is correct..!

this should happen in the block which stores the data as i mentioned above

[Albert Yam]

What do you mean by store some boolean data? Do you mean output [To Workspace] after? Is the boolean data to be used elsewhere?

I still do not see why you need to store it. Would a conditional block there suffice? Isn't the signal coming out of that conditional block be what you are looking for?

[Rahul kumar]

To explain more clearly..

first i have a constant block which should to send data continuously ( 1 to 10 with interval 0.2)

The next block should take this data continuously and store it.. and if it reaches a threshold value (say 6)..! it should trigger the next block :)

[Rahul kumar]

yes it is a signal coming out of that conditional block, not data

[Rahul kumar]

Is my question clear?

Answer 1

[Ryan G]

I don't think this code does what you think it does. There is no real-time operations between MATLAB and Simulink, so when you pause for 1 second it could take 1.5 seconds to process the next point in the sim or it could take 100 seconds in the sim depending on how fast it moves.

Try pre-packaging the data with a Time and Data vector and utilizing a To Workspace block or an Inport. For continuity you want to enable interpolation.

[Kaustubha Govind]

I think Ryan meant to say "From Workspace" instead of "To Workspace" block. :)

Answer 2

[Albert Yam]

Why do you need the 'pause'? If you want an input to 'change over time', use a look-up table, or signal generator.

hm..deja vu

[Albert Yam]

You still have yet to explain why you need to store the value, and you just reiterated your wording, almost verbatim, so no, not more clear.

clock ->  Look-up(n-D) -> Compare to Constant ---> Scope(2)
                       --------------------------> Scope(1)

Where

Look-up(n-D)
table dimensions = 1
First input (row) = 0:length(a)-1
Table data = a    %where in workspace:  >> a = 0:0.1:10;

Compare to Constant

Operator = >
Constant value = 5

Answer 3

[Rajan]

I don't think you can change a value used in constant block ,as the name of the block suggests ,it is a constant value through out the execution.

Don't sent the data from a constant block , instead make a simple addition which increments by 0.2 every time with in the model(not from the code) and send the output of sum block to your data store block . Or compare the output of sum block with comparator block (==6).

I hope this serves your cause.

[Rahul kumar]

yes this makes more sense..! i ll try to this ! thank you :)